Cutting apparatus for paper-cutting machines.



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J. R. REYNOLDS. CUTTING APPARATUS FOR PAPER CUTTING MACHINES. APPLICATION I'ILED 11111.27. 1909.

996,140. Patented June 27,1911.

7n: NORRI PETERS cm. WASHINGTON, n, c.

as an 'r JOHN R. REYNOLDS, OF HARTFORD; CONNECTICUT, ASSIGNOR TO THE SMYTH MANU- FACTURING COMPANY, OF HARTFORD, CONNECTICUT, A CORPORATION OF CON- NECTICUT.

Specification of Letters Patent.

Patented June 2'7, 1911.

Application filed January 27, 1909. Serial No. 474,564.

To all whom it may concern:

Be it known that I, JOHN R. REYNOLDS, a citizen of the United States, residing at Hartford, county of Hartford, and State of Connecticut, have invented certain new and useful Improvements in Cutting Apparatus for Paper-Cutting Machines, fully described and represented in the following specification and the accompanying drawings, forming a part of the same.

This invention relates to certain improvements in cutting apparatus for paper cutting machines. I

In paper cutting machines, the knives are subjected to severe strains during the cutting operation and, further, they become dull very rapidly. It is desirable, therefore, that the knives and the construction by which they are mounted be of such character as not only to enable them to be firmly held in the machine, so that they will resist strains which tend to cause them to shift their position during the cutting operation,

but also to enable them to be quickly removed and replaced by others.

The present invention has for one of its objects to produce an improved knife holding mechanism of such a character that the knives are firmly held in position under the strains developed in the cutting opera tion and which at the same time permits the knives to be quickly removed and replaced.

A further object of the invention is to produce improved knives for use in paper cutting mechanisms.

With these and other objects not specifically referred to in view, the invention consists in certain constructions and in certain parts, improvements and combinations as will be hereinafter fully described and then specifically pointed out.

Referring to the accompanying draw ings,-Figure 1 is a front view of a paper cutting mechanism embodying the invention. Fig. 2 is a section on the line 2-2 of Fig. 1. Fig. 3 is a front view of the knife bar. Fig. 4 is an under side plan view of the construction shown in Fig. 2.

Referring to the drawings which illustrate one embodiment of the invention, 1 indicates a portion of the frame of a paper cutting machine. I The machine selected for the purpose of illustrating the invention is, in its general construction, similar to that shown in the application of S. K. WVhite, Ser. No. 224,776, filed Sept. 17, 1904:. In this machine a pile of books, or other material to be trimmed, is continuously advanced through a set of three knives which operate to trim three sides of the pile. In the present construction, however, in the interest of clearness, only one knife has been shown.

Referring particularly to Fig. 1, a support is indicated at 2 secured to a base 3, the support and base serving to support a pile of books to be trimmed the outline of which is indicated by dotted lines, the books being advanced by a plunger 4 carried on a plunger rod 5.

Mechanisms embodying the invention will include a knife bar which may be variously constructed and arranged. In the construction illustrated, the knife bar, marked 6, is mounted in a slide 7 adjustable on the frame, so as to suitably posit-ion the knife with respect to the pile of books, theadjustment being effected by means of a slot 8 and locking screw 9, or in any other suitable manner. In machines embodying the invention, the knife bar will usually be mounted so that the knife may have a movement at an angle to the direction of the cut, thus effecting what is known as a drawcut. As shown, the slide 7 is provided with upper and lower bars 10, 11 which retain the knife bar in a recess in the slide, these bars 10, 11 being secured to the slide by bolts 12. The upper bar 10, in the construction shown, overlies the entire upper edge of the knife bar, and the lower bar 11 overlies a projection 13 formed on the knife bar, this projection extending only a part of the length. of the bar. This construction permits the knife bar 6 to move freely in the recess in the slide, the movement being effected, in the particular construction shown, by means of a lever 14 and a link 15 connected to perforated lugs 16 on the knife bar.

The best constructions embodying the invention will include a knife holder. While the construction of this holder may be varied, it should be such as to enable it to afford a firm seat for the knife, and it should also be so mounted in the knife bar as to be readily removable therefrom. As shown, the

- knife holder consists of a bar 17 mounted in an undercut recess 18 in the knife bar, the rear side of the holder being shaped so as to accurately fit the recess. While the cooperating locking means by which the knife holder is held in the knife bar may be varied, as shown there is provided a bar 19, this bar having a projection 20 which fits a shoulder formed on a rib 21 on the knife bar. The knife holder is also provided with a recess 22 in which the bar 19 rests, this part of the bar being provided with a projection 23 which enters a groove formed on the front side of the knife holder. The bar 19 is held in position, in the particular construct-ion shown, by threaded bolts 24. With this construction, it will be seen that by loosening the bolts 24 the knife holder may be readily drawn endwise out of the knife bar. While this may be accomplished in any suitable manner, as shown the holder is provided With a threaded recess 25 in which a threaded bar may be screwed to withdraw the holder.

The construction of the knife or blade employed may be varied, but the edge should be formed by grinding or cutting away one side only of the blade, so as to leave the other side which is to come next the pile of paper to be cut, flat. The blade illustrated, marked 26, is cut away at 27 to form its edge. WVhile the means for locking; the blade in position may be varied, as shown, the corner formed between the flat side and rear edge of the blade is cut away to form a shouldered recess 28, and this recess is engaged by a threaded locking bar 29, the knife and bar lying in a recess 30 formed in the knife holder. This locking. bar 29, when employed, may be held in position in any suitable manner, as, for instance, by screws 31. Additional screws, as 32, are also provided for holding the blade to the holder. With this construction the blade is held firmly against the strains developed in the cutting operation, the recess in the holder taking the thrusting strains developed in cutting which do not tend to displace the knife, but, on the contrary, tend to drive the holder into its recess in the knife bar. Further, there is substantially no thrusting strain upon the holding screws in either the bar or the knife blade. In replacing the knives, it is only necessary, as has been indicated, to loosen the bolts 24 and withdraw the holder and the knife. A new holder and knife can then be inserted in the knife bar and the. cutting operation can be immediately resumed. In machines having a plurality of knives and where frequent changes in the knives have to be made on account of the amount of cutting the machine is capacitated to perform, the rapidity with which the knives can be changed is of great importance as it enables the machine to be run practically continuously.

Changes and variations may be made in constructions embodying the invention. The invention is not, therefore, to be limited to the exact construction herein shown and described.

l/Vhat is claimed is 1. In a paper cutting machine, the combination .with a knife blade holder, of a blade having its edge formed by cutting away one side, a locking shoulder on the side of the blade opposite the edge, blade locking means engaging the shoulder and removably secured to the holder, a knife bar, and means for removably securing the holder to the bar.

2. In a paper cutting machine, the combination with a knife blade holder, of a blade having its edge formed by cutting away one side, a locking shoulder 011 the side of the blade opposite the edge, a shouldered locking bar engaging the shoulder and removably secured to the holder, a knife bar, and means for removably securing the holder to the bar.

3. In a paper cutting machine, the combination with a knife blade, holder, of a blade having its edge formed by cutting away one side, a locking shoulder formed on the blade on the side opposite the edge, a shouldered, locking bar engaging the shoulder and removably secured to the holder, screws for additionally securing the blade to the holder, a knife bar, and means for removably securing the holder to thebar.

i. Ina paper cutting machine, the combination with a knife bar having an undercut recess therein, of a knife blade holder, the rear side of which is shapedto fit the undercut recess, said. holder having a knife receiving recess formed therein, means for removably locking the blade holder in the recess in the knife bar, and means for removably securing a knife blade in the recess of the holder.

5. In a paper cutting machine, thecombination with a knife bar having an undercut recess therein, of a blade holder the rear side of which is formed to fit said re.- cess, said holder having a knife receiving shouldered recess. formed therein, a blade having a shouldered recess located in the recess in the holder, a locking bar engaging the recess in the blade and abutting against the shoulder of the recess in the holder, means for removably securing the bar to the blade holder, and screws for additionally securing the blade to the holder.

6. An improved knife blade for paper cutters having its edge formed by cutting away one side and having a locking shoulder set my hand, in the presence of two subscribformed by cutting away a corner between ing witnesses. the rear side and the fiat side of the blade,

and screw holes in the blade, said holes be- JOHN REYNOLDS ing located in the body of the blade shank Witnesses:

ahead of the locking shoulder.

GEO. C. KIMBALL, In testimony whereof, I have hereunto ROBERT H. SOHUTZ.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

